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A primary role of the DHCP server is to ensure that no two devices receive the same IP address. DHCP, which stands for Dynamic Host Configuration Protocol, is responsible for automatically assigning IP addresses and other related configuration settings to devices on a network. This functionality is crucial in preventing IP address conflicts, which can lead to network connectivity issues.

When a device connects to a network, it sends a request to the DHCP server, which then allocates an available IP address from a predefined range, or pool. This process is not only efficient but also helps maintain the integrity of the network by managing IP address allocation systematically. Ensuring unique IP addresses for each device is essential because overlapping IP addresses can cause data packets to be misrouted or lost, significantly disrupting network operations.

In contrast, enabling the network's ability to transmit bandwidth involves other aspects of network design and management beyond the scope of what a DHCP server does. Moving packets across the network is the function of routers and switches, while assigning MAC addresses is not done by the DHCP server but rather is predetermined and hard-coded into each network interface card (NIC). therefore it does not play a role in the DHCP server's functionalities.